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Prophylactic ephedrine during spinal anaesthesia: double-blind study in patients in ASA groups I-III.
C Hemmingsen1, J A Poulsen, A Risbo
1Department of Anaesthesiology, Holbaek Central Hospital, Denmark.
British Journal of Anaesthesia
|September 1, 1989
Summary
Prophylactic ephedrine administration is recommended for patients undergoing spinal anesthesia, particularly those in the American Society of Anesthesiologists (ASA) risk group III, to prevent significant drops in blood pressure.
Area of Science:
- Anesthesiology
- Cardiovascular Physiology
Background:
- Spinal anesthesia can lead to hypotension.
- The American Society of Anesthesiologists (ASA) classification predicts patient risk.
Purpose of the Study:
- To evaluate the efficacy of prophylactic ephedrine in preventing hypotension during spinal anesthesia.
- To assess the impact of ASA classification on hypotension incidence.
Main Methods:
- Forty-eight patients were divided into three ASA I-II-III groups.
- Patients received a fluid load and either ephedrine or placebo.
- Mean arterial pressure (MAP) was monitored.
Main Results:
- Twelve patients (25%) in placebo groups experienced MAP decrease >20%.
- Five patients (10.4%) had MAP decrease >33% and required treatment.
- All ASA III placebo patients had MAP decrease >20%; 50% had >33% decrease.
Conclusions:
- Prophylactic ephedrine is beneficial in preventing spinal anesthesia-induced hypotension.
- The risk of severe hypotension is significantly higher in ASA III patients.
- Ephedrine is particularly desirable for ASA III patients undergoing spinal anesthesia.